JP3259402B2 - Centering method of sheet bar in coarse mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for centering a sheet bar in a rough mill of a row of a continuous hot rolling mill.

[0002]

2. Description of the Related Art In a rough rolling mill of a continuous hot rolling mill, at least one pair of side guides facing each other is disposed on both sides of a sheet bar passing path on the entry side of a rough mill having a tandem structure of a horizontal mill and an edger mill. The opening is set at a position 30 to 50 mm wider than the width of the sheet bar (hereinafter referred to as the plate width) to guide the incoming sheet bar to the line center (centering) and prevent skew. Like that.
However, since the sheet is passed while the opening degree of the side guide is set wide so that the seat bar can smoothly enter, it is hard to say that the guiding effect is satisfactory.

[0003] In recent years, a hydraulically driven side guide has been developed in order to improve the sheet passing property.
1st hot strip subcommittee 51-4 “Measures to improve thin material passing property”), when the sheet bar enters the side guide, tighten so as to reduce the gap with the sheet bar side edge, and actively guide. It came to pass through. FIG. 6 shows an example of such a side guide device. In the figure, the sheet bar A advances in the direction of arrow Z, and the edge bar mill B
Side guides C are provided opposite to each other on both sides of the sheet bar passage on the entrance side of the horizontal mill H and the exit side of the horizontal mill H. These side guides C are driven by a hydraulic cylinder D,
As shown in FIG. 7, through a pinion F and a rack beam G in a pinion stand E, symmetrically with respect to the center of the rolling line (hereinafter referred to as line center), and in a direction perpendicular to the direction in which the sheet bar A passes. The centering of the seat bar A is enabled by opening and closing the side guide C.

When the centering of the sheet bar A is performed by this side guide device, the gap between the side edge of the sheet bar and the side guide C is reduced before the leading end of the sheet bar A bites into the edger mill B. By simultaneously tightening the guide C, the skewed sheet bar A
, The center of the sheet bar A and the mill center of the edger mill B are made to coincide with each other. Once the edger mill B bites the sheet bar A, at least the center of the sheet bar A does not deviate from the mill center of the edger mill B and the side guide center of the side guide C due to the strong centering force of the edger mill B.

[0005] In this type of rough mill, the mill center of the edger mill B and the mill center of the horizontal mill H coincide with the so-called line center of a rolling mill row, and off-center control of these mill centers is not performed intentionally. On the other hand, the delivery side guide C installed on the delivery side of the horizontal mill H
In order to suppress or correct the bending of the sheet bar A sent from the rough mill, it is desired to minimize the gap between the sheet bar A and the sheet bar side edge.

A horizontal feed roller, usually called a table roller, is arranged below any side guide device, and the rotation of the table roller causes the sheet bar to pass in a predetermined conveying direction at a predetermined passing speed. It is planed.

[0007]

However, in such a conventional rough mill, the horizontal roll and the edger mill of the horizontal mill H are usually limited due to restrictions on the construction of the horizontal mill H and the housing and the columns J of the edger mill B and the equipment. It is difficult to install the vertical roll B in close proximity to each other. Therefore,
In such a conventional method of centering a sheet bar in a rough mill, when rolling a so-called nose-bent material in which an extreme bending is generated at the tip end portion Aa of the sheet bar A, as shown in FIG. The center SBCL of the horizontal mill H is the same as the mill center EMCL of the edger mill B and the side guide center SGCL of the side guide C, but the front end Aa of the sheet bar A is released from the centering force. , That is, the line center LC goes off-center. When only the leading end a of the nose-curved sheet bar A is bitten by the horizontal mill H in the off-center state, this bend increases the camber of the rolled sheet bar A, so that the product accuracy is not reduced. Of course, there is a risk of rubbing or colliding with the exit side guide C of the horizontal mill H when the side mill C is severe, and there is a risk that the sheet bar side edge is severely damaged. There is also.

In order to solve these problems, a small side guide device having a storage type side guide is installed in the immediate vicinity of the horizontal mill so as to be stored inside a structure such as a housing or a support of the horizontal mill and the edger mill. There are also things. However, this side guide device is inevitably reduced in size due to restrictions on facilities, and therefore has a limit in increasing the guiding pressure, cannot expect a positive centering effect, and suppresses the camber. Is not enough. In addition, the equipment cost increases by the need to separately install individual side guide devices,
On the contrary, the space for this also increases.

The present invention has been developed in view of these problems, and realizes a sheet mill of a rough mill capable of obtaining a sufficient centering effect and a camber suppressing effect while realizing space saving and cost saving. It is an object to provide a centering method.

[0010]

According to a first aspect of the present invention, there is provided a method for centering a sheet bar in a rough mill, comprising the steps of:
In a rough rolling mill row of a hot continuous rolling mill, an edger mill and a horizontal mill are juxtaposed to the rough mill, and a sheet bar is a rough mill that is rolled from the edger mill to a horizontal mill. The bending state and the passing state in the direction are detected in advance, and from the bending state and the passing state, the edger off-center amount of the sheet bar in the edger mill when the leading end of the sheet bar bites into the mill center of the horizontal mill. Calculated, before the leading end of the sheet bar bites into the horizontal mill, approximately at the mill center of the horizontal mill.
The Mirusenta of the edge catcher off center by amount Ejjamiru to the off-center controlled to match, after the leading end of the sheet bar is bitten in a horizontal mill while off-center the Ejjamiru, the tip portion of the horizontal mill myrcene
The centering of the mill center of the edger mill is controlled while holding the mill center.

According to a second aspect of the present invention, there is provided the centering method of the sheet bar in the rough mill, wherein at least a pair of side guides are disposed on both sides of the sheet bar passage at the entry side of the edger mill. In the set rough mill, the side guide off-center amount of the sheet bar in the side guide when the leading end of the sheet bar bites into the mill center of the horizontal mill from the bent state and the passed state of the sheet bar in the passing direction. It calculates the water before the front end portion of the sheet bar biting in the horizontal mill
The side guide center of the side guide is off-center controlled by the side guide off center amount so as to substantially match the mill center of the flat mill , and the tip end of the sheet bar is bitten by the horizontal mill with the side guide off center. Later, while holding the tip at the mill center of the horizontal mill,
Further, the centering control of the side guide center of the side guide is performed.

[0012]

According to the method for centering a sheet bar in a rough mill according to the first aspect of the present invention, the leading end of the sheet bar is set to a horizontal mill based on a bending state and a passing state of the sheet bar in the passing direction detected in advance. The edger off-center amount of the sheet bar in the edger mill when the sheet bar bites into the mill center is calculated. Then, by tracking monitoring or the like, the center of the edge bar is off-center controlled by the edger off-center amount before the front end of the sheet bar bites into the horizontal mill, and in this state, the front end of the sheet bar is moved to the horizontal mill. So they can bite
The tip of the sheet bar coincides with the mill center of the horizontal mill. Subsequently, after the front end of the sheet bar is bitten by the horizontal mill , the front end is moved to the horizontal mill.
When the center of the mill center of the edger mill is controlled while holding the edge bar, even if the front end of the sheet bar is bent, the front end is held by the mill center by a horizontal mill having a larger retraction force, and the straightening is performed. Since the edge of the sheet bar is centered by the strong edger mill, camber on the horizontal mill exit side can be suppressed. Further, since the vertical roll of the edger mill is originally rotated in the sheet passing direction of the sheet bar, there is no fear that the vertical roll of the edger mill and the side edge of the sheet bar rub or collide with each other.

In the centering method of a sheet bar in a rough mill according to the present invention, the leading end of the sheet bar is engaged with the mill center of the horizontal mill from the bent state and the passed state of the sheet bar in the passing direction. Then, the side guide off-center amount of the seat bar in the side guide at the time of the insertion is calculated. In addition to the off-center control of the edger mill, the side guide center of the side guide is off-center controlled by the amount of the side guide off center before the leading end of the sheet bar bites into the horizontal mill by tracking monitoring or the like. Then, the leading end of the sheet bar is bitten into the horizontal mill. For this reason, together with the offset control of the edger mill, the leading end of the sheet bar sent out from the edger mill is in a free state without particularly applying a bending correction force, and the leading end of the sheet bar coincides with the mill center of the horizontal mill. . After that, hold the tip on the mill center of the horizontal mill.
While, by centering control the side guide of the side guide center with centering control of the Ejjamiru, since Ejjamiru after the elongated portion of the sheet bar is centered, more camber suppressing effect in the horizontal mill delivery side It can be assured.

[0014]

FIG. 1 shows an embodiment of a hot rolling mill embodying a method for centering a sheet bar in a rough mill according to the present invention. In this figure, an edger mill B and a horizontal mill H are arranged side by side, and the sheet bar is an edger mill B
Through the horizontal mill H in the direction of arrow Z. A pair of side guides 1 and 2 facing each other are installed parallel to each other on both sides of the sheet bar passage on the entrance side of the edger mill B and the exit side of the horizontal mill H. On the entry side of the entry side guide 1, a guide side guide 20 extending outward is provided so as to be rotatable toward the entry side, and the entry side end of the guide side guide 20 is , Is rotatably connected to the frame 22 through an elongated hole 21 formed at the end. Incidentally, a large number of rotatable vertical rolls 23 are provided on the side surfaces of the sheet bar passages of the entrance side guide 1 and the exit side guide 2 so as to protrude into the passages.

On the other hand, a large number of table rollers 3 are interposed in the frame 22 below the sheet bar passage between the side guides 1 and 2 via bearings 24 in a direction perpendicular to the passage direction. It is arranged. Of these table rollers 3, eight table rollers 3 disposed below the exit side guide 2 and six exit rollers of the table rollers 3 disposed below the entrance side guide 1. The table roller 3 is rotated directly in the sheet passing direction by a motor 4. The other table roller 3 disposed below the entry side guide 1 and the table roller 3 disposed below the guide side guide 20. The provided table roller 3 is rotated in the passing direction by a single motor 5 via a driving force transmission device 25 such as a gear transmission mechanism.

Two hydraulic cylinders 6 on a cylinder stand 26 are connected to the side guides 1 and 2, respectively, and are driven independently by these hydraulic cylinders 6. Then, the side guides 1 and 2 synchronize the two hydraulic cylinders 6 so as to be mutually perpendicular from the position indicated by the solid line to the position indicated by the imaginary line in FIG. Moved in parallel. The guide side guide 20 is rotated from the position indicated by the solid line to the position indicated by the imaginary line together with the side guide 1 on the entry side about the elongated hole 21 substantially as a center of rotation.

A predetermined hydraulic pressure is supplied to the hydraulic cylinder 6 via a hydraulic driving device 7, and the hydraulic cylinder 6 is applied with a predetermined pressure to a predetermined position by the hydraulic driving device 7. It can be stopped with. Therefore, if the center of the two lateral beams of each of the side guides 1 and 2 is defined as a side guide center, in this embodiment, the hydraulic cylinder 6 is controlled to control the side guide center and the center of the passageway (line center). Can be set freely in the vertical direction in FIG.

The hydraulic drive device 1 is controlled by a hydraulic pressure setting signal from a side guide control device 8 as shown in FIG. The rotation of each of the motors 4 and 5 is controlled by a control signal from a tracking control device 9, and
The rotation status such as the rotation speed and the rotation speed is monitored by the tracking control device 9 by, for example, a change in a load current value. The side guide control device 8 exchanges signals with the tracking control device 9, and the tracking control device 9 exchanges signals with the higher-order continuous rolling mill control device 10. Note that the continuous rolling mill control device 10 is for comprehensively controlling and monitoring the rolling speed, including the rolling amount and leveling of the mill according to the specifications and specifications of the sheet bar A, and the like. The tracking control device 9 obtains the position information of each sheet bar A, monitors the sheet passing speed from the load current values of the motors 4, 5 and the like, and determines the rotation speed and conveyance of each mill related to the sheet passing speed. The necessary rotation speed of the table roller 3 and the like are controlled by the continuous rolling mill controller 10.
And to control.

A microcomputer (not shown) is provided in the side guide control device 8, and controls the flow rate / oil pressure of the hydraulic drive device 7 as shown in FIG. 2 according to the tracking information from the tracking control device 9 and the passing speed. Thus, the opening degree and the position of the side guides 1 and 2 are controlled. In this embodiment, a storage type side guide 29 is provided between the edger mill B and the horizontal mill H so as to be stored in a housing or a column of the mill. No special control is performed by the side guide control device 8, and the opening degree is kept at a predetermined opening calculated from the specification of the sheet bar and the rolling reduction of each mill.

On the other hand, the edger mill B is conventionally made of HV
It is almost the same as a normal edger mill used for a tandem mill or the like, but the left and right vertical rolls 30 in the figure move freely with respect to the line center by a control signal to a position setting motor 31 for moving the rolls. It is possible to make it. For example, as shown in FIG. 2, the edger mill B used in this embodiment applies the rotational force of the main drive motor 32 to one rotating shaft 33 and uses two sets of bevel gears 34 attached to the rotating shaft 33. It branches and transmits to each vertical roll 30 in the opposite direction. On the other hand, the rotational force of the two position setting motors 31 provided at the lower part of the apparatus is the rotational movement of the screw mechanism or the like.
It is converted into a linear motion force by the linear motion conversion mechanism 35,
By the linear motion force, the two vertical rolls 30 are individually moved together with the mounting base 36 and the bevel gear unit 37 so that the gap (roll opening) between the vertical rolls 30 can be changed / adjusted. At this time, each bevel gear 34
The rotating shaft 33 and the rotating shaft 33 are connected by a spline 33a, so that the bevel gears 34 of the respective sets slide on the spline 33a as the vertical roll 30 and the bevel gear unit 37 move. Therefore, the gap between the two vertical rolls 30 is determined by the sheet width and a predetermined amount of reduction. Can be off-centered or centered.

As shown in FIG. 2, the driving device for the rotary drive and the position setting change is an edger mill control device 11 as shown in FIG.
Is controlled by each setting signal from the CPU. Further, the edger mill control device 11 exchanges signals with the tracking control device 9, and the tracking control device 9 exchanges signals with the continuous rolling mill control device 10 as described above.

A microcomputer (not shown) is provided in the edger mill controller 11, and the rotation speed / rotation time of the main drive motor 32 and the position setting motor 31 based on a program stored in advance in the microcomputer. The rotation and opening / position of both vertical rolls 1 are controlled by controlling the number of rotations. In the centering method of the seat bar according to the present invention, it is necessary to detect a bent state and a passing state of the sheet bar in order for the edger mill control device 11 and the side guide control device 8 to operate according to a predetermined program. In this embodiment, as shown in FIG. 1, the camber meter control device 12 detects the width of the sheet bar, the camber profile, and the passing state from the detection signal of the camber meter detector 13 provided above the guide side guide 20. And sends these data to the continuous rolling mill controller 10.

Here, the measurement principle of the camber meter detector 13 and the camber meter controller 12 used in this embodiment will be briefly described. The detection unit 13 includes three off-center meters that measure the center position (off-center position) of the sheet bar with reference to the rolling line center. These off-center meters are, for example, one sheet width meter,
It is composed of two edge sensors and the like, and for these sensors, for example, a CCD camera of a lower light source system is used.

In FIG. 3, the x axis corresponds to the longitudinal direction of the sheet bar, the y axis corresponds to the width direction of the sheet bar, and xa, x
It is assumed that b and xc respectively correspond to the positions of three off-center meters. Now, let the shape of the sheet bar (camber profile curve) be the following n-th order polynomial with respect to x:
Assume that it is represented by the formula. y = F (x) = a ₀ + a ₁ · x +... + a _n × x ⁿ (1) During rolling, the sheet bar is passed in the positive direction of the x-axis, but here, the reverse. The theory is developed based on the assumption that the three off-center meters move in the negative x-axis direction while the seat bar is stationary.

At a certain point, the center positions of the sheet bars measured by the three off-center meters are A, B, and _C, and the intersection of a straight line passing through A and B and a straight line X = X _C is D.
The distance between -D is defined as M. The trajectory of the calculation function M obtained with the progress of the off-center is expressed by an (n−2) -th order function related to x as in the following two equations. y = G (x) = b ₀ + b ₁ · x +... + b _n−2 × x ⁿ⁻² (2) Here, each coefficient a ₀ , a ₁ ,. a _n and b _0, b _1, ........., simple equation between the b _n-2 is established.

In this way, the calculation function M is measured at regular intervals, for example, by sampling at predetermined time intervals, etc., as the sheet bar advances, and this locus is approximated to an n-2 order polynomial to obtain each coefficient. Is calculated, the camber profile of the seat bar is obtained from the above equation (1). By combining the camber profile with the board width information obtained by the board width sensor, it is possible to obtain information on the passing state of the sheet bar in what state the sheet bar is passed.

Information such as the camber profile, the sheet width, and the passing state calculated by the camber meter control device 12 is sent to the continuous rolling mill control device 10, and the continuous rolling mill control device 10 receives the information. The specification data of the sheet bar, the amount of reduction of each mill, and the information of the width and thickness of the rolled sheet are placed on the sheet bar and sent to the tracking control device 9. Further, the tracking control device 9 puts the tracking information of the sheet bar on the various information and sends the information to the side guide control device 8 and the edger mill control device 11.

Next, the processing performed by the side guide controller 8 and the edger mill controller 11 and the operation thereof will be described. Although the specific numerical values and the types of control signals calculated by the two control devices 8 and 11 are different, the processing procedure itself is almost the same. Will be described collectively, and specific operations will be described later.

The side guide controller 8 first calculates the opening of the entrance side guide 1 from the plate width calculated by the camber meter controller 12. It is necessary to correct or suppress the skew of the sheet bar as well as the opening of the side guide 1. Next, with the opening of the entrance side guide 1 set to the calculated opening and the sheet bar sandwiched, the front end of the sheet bar is moved from the camber profile to the mill center of the horizontal mill H, that is, the line center. Is calculated, the off-center of the seat bar generated at the entry side guide portion is calculated as the side guide off-center amount.

Next, when the sheet bar is passed at a predetermined passing speed based on the tracking information obtained from the tracking control device 9, the point at which the tip end of the sheet bar bites into the horizontal mill H (specifically, Specifically, a horizontal mill biting time) is calculated. Next, tracking information including the threading speed and the tracking position is read from the tracking control device 9 as needed to correct the horizontal mill biting time.

Before the corrected horizontal mill biting time, the side guide center is off-center controlled with respect to the line center by the side guide off center amount. Specifically, since the side guide center is off-centered by changing the position of each lateral beam while keeping the opening degree of both side guides 1 constant, the position of each lateral beam is calculated, and the lateral beam position is calculated. Is transmitted to each of the hydraulic drive devices 7.

Next, when the tracking information is read and the front end of the sheet bar is completely bitten by the horizontal mill H, the side guide center of the entry side guide 1 is centered with respect to the line center. Specifically, since the side guide center is centered by changing the position of each lateral beam while maintaining the opening degree of both side guides 1 constant, the position of each lateral beam is calculated, and the lateral beam position is calculated. Control signals that satisfy
Send to.

On the other hand, the edger mill controller 11 first calculates the opening degree of the vertical roll 30 of the edger mill B from the strip width calculated by the camber meter controller 12 and the edge mill reduction amount given by the continuous rolling mill controller 10. . Next, when the sheet bar is rolled at the opening of the vertical roll 30, the rotation speed of the vertical roll 30 sufficient to pass the sheet bar at a predetermined passing speed is calculated, and the rotation speed is satisfied. The number of rotations of the main drive motor 32 is calculated, and the control signal is sent to the motor 32.

Next, while the opening of the edger mill B is set to the calculated opening and the sheet bar is being rolled,
From the camber profile, the off-center of the sheet bar generated at the edger mill portion when the front end of the sheet bar coincides with the mill center of the horizontal mill, that is, the line center, is calculated as the edger mill off-center amount.

Next, when the sheet bar is passed at a predetermined passing speed based on the tracking information obtained from the tracking control device 9, the point at which the leading end of the sheet bar bites into the horizontal mill H (specifically, Specifically, a horizontal mill biting time) is calculated. Next, tracking information including the threading speed and the tracking position is read from the tracking control device 9 as needed to correct the horizontal mill biting time.

The edger mill center is off-center controlled relative to the line center by the edger mill off-center amount before the corrected horizontal mill biting time. Specifically, the edger mill center is off-centered by changing the position of each of the vertical rolls while keeping the opening degree of both the vertical rolls 30 constant.
Is calculated, and a control signal that satisfies the vertical roll position is sent to the position setting motors 31.

Next, when the tracking information is read and the tip of the sheet bar is completely bitten by the horizontal mill H, the edger mill center of the edger mill B is centered with respect to the line center. Specifically, both vertical rolls 3
Since the edger mill center is centered by changing the position of each vertical roll 30 while keeping the opening degree of 0 constant, the position of each vertical roll 30 is calculated, and the control signal satisfying the vertical roll position is calculated. To the position setting motors 31.

By performing such processing and control, as shown in FIG. 4, until the leading end Aa of the sheet bar A is engaged with the horizontal mill H, the edger mill B
In order to perform offset control of the entrance side guide 1 in accordance with the edger mill offset amount and the side guide offset amount, the leading end Aa of the sheet bar A is aligned with the mill center HMCL of the horizontal mill H, that is, the line center LC. H, and once the sheet bar A
When the leading end Aa of the edge mill A is bitten by the horizontal mill H, as shown in FIG.
In addition, in order to control the centering of the entrance side guide 1, particularly, a large bend generated at the front end portion Aa of the sheet bar A is corrected or suppressed by the strong centering effect of the edger mill B, and the subsequent portions are adjusted to the entrance side guide. The centering by 1 makes it possible to suppress the bending of the entire sheet bar A and to center the center SBCL of the sheet bar A, assuring the effect of correcting and suppressing the bending of the edger mill B.

In this embodiment, when the sheet bar passes through the side guide, the sheet bar is tightened by the entry side guide to allow the sheet to pass therethrough, and at the same time, the front end of the sheet bar is engaged with the horizontal mill. Although the entrance side guide was offset controlled together with the edger mill,
If the edge bar does not prevent the sheet bar from skewing or curving, and if the edge bar has a high degree of certainty that the edge bar will bite the front end of the sheet bar due to the interaction with the tracking control device, the seat bar is necessarily tightened by the side guide. There is no need to pass through. Then, the rubbing and collision between the side edge of the sheet bar and the side guides are reduced, and a reduction in the sheet passing speed and a reduction in the production amount can be suppressed. Of course, when such centering control is performed, it is necessary to prevent the sheet bar from becoming extremely skewed before the biting by the edger mill. In addition, it must be noted that the side guides also tighten the seat bar at the offset position, and thereafter, the control complexity such as immediately performing the centering control similarly to the edger mill occurs.

Although not described in detail here, the output side guides of the horizontal mill are the same as the conventional ones in accordance with the tracking information of the sheet bar, the amount of reduction of each mill, and the offset / centering control of the edger mill and the side guides. It is necessary to control the opening degree more accurately than before. This is because the bending and skew of the sheet bar on the exit side of the horizontal mill are greatly reduced according to the centering method of the sheet bar of the present invention. Therefore, the effect is obtained by sufficiently tightening the exit side guide. Is more reliable, and by performing such control, the exchange of the sheet bar in the next process can be facilitated / accurate, and the manufacture of a seat bar with more dead flatness can be realized. is there.

Further, in this embodiment, a structure in which the sheet passing speed is indirectly detected from a change in the load current value of the motor driving the table roller is employed, but this detecting means is not limited to this. Instead, for example, a laser Doppler-type passing speed detector may be provided to directly detect the passing speed. Furthermore, in this embodiment, two hydraulic cylinders are installed on each of the lateral beams constituting the entrance side guide and the exit side guide, and are installed on both sides of the sheet bar passage plate path. If there is a concern that the dead space becomes too large in the structure, use the conventional side guide opening and closing mechanism shown in FIG.
A moving mechanism for moving the entire side guide opening / closing mechanism in a direction orthogonal to the sheet bar passage plate may be provided. In this case, the structure of the opening / closing mechanism is simplified, and the opening degree control can be easily performed based on only the board width information. However, it is difficult to avoid a complicated and large-scale structure of the moving mechanism. However, there are advantages and disadvantages in that the calculation of the off-center amount by the side guide control device is also somewhat troublesome.

Further, in this embodiment, the information on the bending of the sheet bar and the information on the passing of the sheet bar are obtained by the camber meter. However, for example, the information is previously contained in the feeding information of the sheet bar from the previous process. In such a case, it can be used directly, and the information detecting means is not limited to these. In addition, in this embodiment, when the sheet bar passes through the side guide, the side guide is tightened and the offset control is performed at the same time, and when the sheet bar is bitten by the edger mill, the edger mill is offset-controlled, so that before the horizontal mill bites. The tip of the sheet bar is controlled so that it is centered on the horizontal mill.For example, when passing through the side guide, the side guide center is aligned with the line center and tightened. It is also possible to perform offset control of the two just before the horizontal mill bites, and the point is that if the tip of the sheet bar does not bite into the horizontal mill, it does not matter what time the horizontal mill or side guide is offset controlled. There is no.

[0043]

As described above, according to the centering method of the sheet bar in the rough mill of the present invention, the off-center amount of the sheet bar in the edger mill when the leading end of the sheet bar bites into the mill center of the horizontal mill. Before the front end of the sheet bar bites into the horizontal mill, the mill center of the edger mill is off-center controlled by the amount of the off center so that the front end of the sheet bar substantially matches the mill center of the horizontal mill. After being bitten by the mill, the tip is kept at the mill center of the horizontal mill.
By controlling the center of the mill center of the edger mill while holding, the tip of the sheet bar is held on the mill center by a horizontal mill having a large pulling force, and even if the tip has a bend, a large straightening force is obtained. Since the bending is corrected or suppressed by the edger mill, the camber on the exit side of the horizontal mill can be suppressed without providing any additional equipment.

Further, by controlling the entrance side guide in the same manner in accordance with such control, a long portion after the edger mill of the sheet bar is centered, so that the camber on the exit side of the horizontal mill is suppressed. The effect can be made more reliable.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a rough mill facility in which a sheet bar centering method in a rough mill according to the present invention is implemented.

FIG. 2 is a structural explanatory view of a driving device and a control device of the edger mill in the rough mill equipment of FIG. 1;

FIG. 3 is an explanatory diagram of a camber profile calculation method using a camber meter installed in the coarse mill facility of FIG. 1;

FIG. 4 is an operation explanatory view showing a state before the front end portion of the sheet bar bites into the horizontal mill in the method of centering the sheet bar performed by the rough mill equipment of FIGS. 1 and 2;

FIG. 5 is an operation explanatory view showing a state after the front end portion of the sheet bar has bitten into the horizontal mill in the sheet bar centering method performed by the rough mill equipment of FIGS. 1 and 2;

FIG. 6 is a schematic plan view of a rough mill facility using an example of a sheet bar centering method in a conventional rough mill.

FIG. 7 is a side view showing a drive mechanism of the side guide device of FIG.

FIG. 8 is an explanatory diagram showing a centering state of a sheet bar in a conventional centering method of a sheet bar.

[Explanation of symbols]

 1 is an entrance side guide 2 is an exit side guide 3 is a table roller 4 is a motor 5 is a motor 6 is a hydraulic cylinder 7 is a hydraulic drive device 8 is a side guide control device 9 is a tracking control device 10 is a continuous rolling mill control device 11 Is an edger mill controller 12 is a camber meter controller 13 is a camber meter detector 32 is a main drive motor 31 is a position setting motor A is a sheet bar B is an edger mill H is a horizontal mill

Continuation of the front page (72) Inventor Nobuhiro Tasoe 1st Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Pref. Ishikawajima-Harima Heavy Industries Co., Ltd. Yokohama second factory (56) References Hei 4-33712 (JP, A) JP-A-57-39018 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 39/14 B21B 37/00 B21B 37/30

Claims (2)

(57) [Claims] An edger mill and a horizontal mill are arranged side by side in a rough rolling mill row of a continuous hot rolling mill, and a sheet bar is provided in a rough mill in which a sheet bar is rolled from an edger mill to a horizontal mill. The bending state and the passing state of the sheet bar with respect to the passing direction are detected in advance, and based on the bending state and the passing state, the edge of the sheet bar in the edger mill when the tip end of the sheet bar bites into the mill center of the horizontal mill. Calculate the jaoff center amount, and before the end of the sheet bar bites into the horizontal mill,
The edge catcher off center amount only Ejjamiru of Mirusenta order to substantially match the off-center control to Mirusenta, after the leading end of the sheet bar while off-center the Ejjamiru is meshed with a horizontal mill, the tip portion horizontal
A centering method for a sheet bar in a rough mill , wherein centering control of the mill center of the edger mill is performed while holding the mill center of the mill. 2. A rough mill in which at least one pair of side guides is arranged on at least both sides of a sheet-bar passing path on the entry side of the edger mill, in a bent state with respect to a sheet-passing direction of the sheet bar. Calculate the side guide off-center amount of the sheet bar in the side guide when the tip of the sheet bar bites into the mill center of the horizontal mill from the passing state, and before the tip of the sheet bar bites into the horizontal mill To the mill center of the horizontal mill
After the side guide center of the side guide is off-center controlled by the amount of the side guide off center so as to substantially coincide with the side guide, and after the front end of the sheet bar is bitten by the horizontal mill with the side guide off center, the front end The horizontal
The centering method of a sheet bar in a rough mill according to claim 1 , wherein centering control of the side guide center of the side guide is performed while holding the side guide center at the mill center of the mill.